wip: age based filtering of options

config/services.yaml

@@ -72,6 +72,7 @@ services:
         arguments:
             $handlers:
                 # Simple handlers (no dependencies) - use class names
+                - 'App\Form\Service\ParticipantDateOfBirthFieldHandler'
                 - 'App\Form\Service\ParticipantAssignedRoomFieldHandler'
                 # Complex handlers (with dependencies) would use service references like:
                 # - '@participant.complex.handler'